The paper presents
radiation performance of a gap coupled split circular patch with elliptical
slot filled with elliptical patch. Initially, a circular elliptical ring slot
antenna is taken and it is modified step by step to achieve an end product with
desired performance. The performance of designed antenna after each step is
presented systematically. The simulated and measured results of proposed
antenna are compared with that of a circular elliptical ring slot antenna. The
gap between two gap-coupled semi circular elliptical ring structures and the
length of major and minor axis of inserted inner elliptical patch are optimized
to achieve best performance. It is observed that with proposed modifications in
circular patch geometry, impedance bandwidth, gain and radiation efficiency of
antenna are improved considerably. The resonance frequency of end product is
lower than that of a circular elliptical ring slot antenna which indicates that
for achieving identical resonance frequencies from circular elliptical ring
slot antenna and modified circular patch geometry, effective patch size of
modified antenna must be reduced. The outcome results into a further compact
circular patch antenna with much improved performance.